Make conversation queues mutually exclusive

docs/frontend.md

@@ -78,7 +78,7 @@ Exchange-library uploads require an explicit consent checkbox before the raw ima
 
 Conversation reply composers include a collapsed saved-image picker. It lists only server-approved assets for the latest inbound request, keeps thumbnails blurred until revealed, and requires selection plus a dedicated confirmation dialog before sending. The server remains authoritative and may reject a choice if the conversation changes before the rate-limited send executes.
 
-The conversation inbox has a system-derived **Account deleted** bucket alongside the operator-maintained open, snoozed, and done queues. A deleted recipient is excluded from the default, unread, needs-reply, waiting, manual, and image buckets and is labelled in both the list and detail views. Suspended profiles are not treated as deleted.
+The conversation inbox assigns every row to exactly one primary workflow queue: **Needs attention**, **Waiting**, **Sellers**, **Snoozed**, **Done**, **Deleted**, or **Archived**. Removed-account history belongs only to Archived, deleted recipients belong only to Deleted, and seller/off-platform outcomes belong only to Sellers, so none can leak into actionable work. Unread state, manual ownership, and received images are independent badges and secondary toggles rather than competing queues. The default queue is Needs attention. Suspended profiles are not treated as deleted.
 
 ## Feature structure